Female singers with upbeat dance songs are far more likely to top the music charts nowadays, according to new findings by researchers at the University of California, Irvine. The study also found a downward musical trend in happiness and an increase in sadness.

The study, published in the journal Royal Society Open Science, examined 500,000 popular songs released in the UK over a three decade period, from 1985 and 2015, and categorized them each based on their mood.

“‘Happiness’ is going down, ‘brightness’ is going down, ‘sadness’ is going up, and at the same time, the songs are becoming more ‘danceable’ and more ‘party-like,’” co-author Natalia L. Komarova told The Associated Press.

Of course, researchers emphasize that a gradual decrease in the average “happiness” index does not mean that all successful songs in 1985 were “happy” and all successful songs in 2015 were “sad.” They were looking for average trends in the acoustic properties of music and the moods describing the sounds.

The overall mood shifts in the songs’ musical elements fall in line with past studies that have examined lyrical content changes over the years. They have found that positive emotions, on the whole, have declined; while indicators of loneliness and social isolation have increased.

“So it looks like, while the overall mood is becoming less happy, people seem to want to forget it all and dance,” says Komarova, a mathematician and evolutionary biologist who led the study. She added, “The public seems to prefer happier songs, even though more and more unhappy songs are being released each year.”

Some songs with a low happiness index in 2014 include “Stay With Me” by Sam Smith, “Whispers” by Passenger and “Unmissable” by Gorgon City. Songs from 1985 with a high happiness index include “Glory Days” by Bruce Springsteen, “Would I Lie to You?” by the Eurythmics, and “Freedom” by Wham!

Additionally, researchers found the most successful musical genres of recent are dance and pop, with a “clear downward trend” in the success of rock, beginning in the early 2000s.

The researchers also found that the “maleness” of songs — or the frequency of male singers in popular music — has decreased over the last 30 years. “Interestingly, successful songs exhibit their own distinct behavior: They tend to be happier, more party-like, less relaxed and more likely to be sung by a woman than most.”

The same trends hold true for the US market, based on a preliminary review of data by researchers. A few 2014 hits that meet the study’s qualifications for successful pop music include Clean Bandit‘s “Rather Be,” Taylor Swift‘s “Shake It Off,” and Meghan Trainor‘s “All About That Bass.”

The findings arrive at a critical juncture when the music industry is grappling with issues of gender inequality — where men are overwhelmingly dominating the visible ranks of artists and songwriters, despite studies like these showing a strong cultural/consumer yearning for female dance/pop hits in the contemporary global music climate.